<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
  <style>
    .wrap {
      width: 100%;
      display: flex;
      margin: 0.2rem 0 0 0;
      position: relative;
    }
    
    /*左侧的导航样式*/
    .nav_left {
      width: 21.1875rem;
      overflow: scroll;
    }
    
    .nav_left::-webkit-scrollbar {
      display: none;
    }
    
    .nav_content {
      white-space: nowrap;
      padding: 0 0.7rem;
    }
    
    .nav_content span {
      display: inline-block;
      padding: 0.4rem 0.6rem;
      font-size: 0.875rem;
    }
    
    .nav_content .active {
      border-bottom: 2px solid #7f4395;
      color: #7f4395;
    }
    
    .nav_left,
    .down {
      float: left;
    }
    
    /*右侧导航部分*/
    .down {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .gray {
      color: gray;
      display: inline-block;
      vertical-align: middle;
    }
  </style>
</head>
<body>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="username"/>
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="listAge" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select> 
    </div>
    <div>
      <button @click="getFn">添加/修改</button>
    </div>
    <div>
      <table
        border="1"
        cellpadding="10"
        cellspacing="0"
      >
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="item.id">
          <td> {{ index + 1 }} </td>
          <td> {{ item.name }} </td>
          <td> {{ item.age }} </td>
          <td> {{ item.sex }} </td>
          <td>
            <button @click="fn(index)">删除</button>
            <button @click="get(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        list: [
            {name: '张三', age: 18, sex: '男'},
            {name: '李四', age: 18, sex: '女'},
            {name: '王五', age: 18, sex: '男'},
           
        ],
        username: '',
        listAge: '',
        gender: '男',
        listIndex: null
      },
      methods: {
        fn(index) {
            this.list.splice(index, 1)
        },
        getFn() {
            if(this.username === '') return alert('请输入姓名')
            if(this.listAge === '') return alert('请输入密码')
            this.list.push({
                name: this.username,
                age: this.listAge,
                sex: this.gender
            })
        },
        get(index) {
            let obj = this.lsit[index]
            this.username = obj.name
            this.listAge = obj.age
            this.gender = obj.sex
            this.listIndex = index
        }
      }
    })
  </script>
</body>
</html>